<!DOCTYPE HTML>
<html>
<head>
  <title>Test ScriptProcessorNode in cycle with no listener is collected</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

var observer = function(subject, topic, data) {
  var id = parseInt(data);
  var index = ids.indexOf(id);
  if (index != -1) {
    ok(true, "Collected AudioNode id " + id + " at index " + index);
    ids.splice(index, 1);
  }
}

SpecialPowers.addObserver(observer, "webaudio-node-demise", false);

SimpleTest.registerCleanupFunction(function() {
  if (observer) {
    SpecialPowers.removeObserver(observer, "webaudio-node-demise");
  }
});

var ac = new AudioContext();

var testProcessor = ac.createScriptProcessor(256, 1, 0);
var delay = ac.createDelay();
testProcessor.connect(delay);
delay.connect(testProcessor);

var referenceProcessor = ac.createScriptProcessor(256, 1, 0);
var gain = ac.createGain();
gain.connect(referenceProcessor);

var processCount = 0;
testProcessor.onaudioprocess = function(event) {
  ++processCount;
  switch (processCount) {
  case 1:
    // Switch to listening to referenceProcessor;
    referenceProcessor.onaudioprocess = event.target.onaudioprocess;
    referenceProcessor = null;
    event.target.onaudioprocess = null;
  case 2:
    // There are no references to testProcessor and so GC can begin.
    SpecialPowers.forceGC();
    break;
  case 3:
    // Another GC should not be required after testProcessor would have
    // received another audioprocess event.
    SpecialPowers.forceCC();
    // Expect that webaudio-demise has been queued.
    // Queue another event to check.
    SimpleTest.executeSoon(function() {
      SpecialPowers.removeObserver(observer, "webaudio-node-demise");
      observer = null;
      event.target.onaudioprocess = null;
      ok(ids.length == 0, "All expected nodes should be collected");
      SimpleTest.finish();
    });
    break;
  }
};

function id(node) {
  return SpecialPowers.getPrivilegedProps(node, "id");
}

// Nodes with these ids should be collected.
var ids = [ id(testProcessor), id(delay), id(gain) ];
testProcessor = null;
delay = null;
gain = null;

</script>
</pre>
</body>
</html>
